Treatment device for recycling treatment of municipal sludge

Abstract

The invention belongs to the technical field of municipal sludge resourceful treatment, and particularly relates to a municipal sludge resourceful treatment device which comprises a sludge carbonization device, a mounting base and a combustion furnace. The sludge carbonization device comprises an inner cylinder and an outer cylinder; a conical bottom support is arranged at the bottom of the inner cylinder body; the outer cylinder is coaxially sleeved outside the inner cylinder, and a double-helix channel is arranged between the outer cylinder and the inner cylinder; the bottoms of the two spiral channels are respectively communicated with a furnace smoke outlet of the combustion furnace and the inner bottom of the inner barrel body; the mounting base is arranged below the sludge carbonization device and is connected with an annular seat fixed on the outer side of the outer barrel through a plurality of magnetic devices and a plurality of inclined spring pieces. According to the scheme, mud blocks can be conveyed, vibrated and carbonized; in addition, the flue gas of the combustion furnace is separated from the gas generated by carbonization of the clods, so that the waste heat of the flue gas can be conveniently recovered, and meanwhile, the harmful gas generated by carbonization of the clods can be conveniently treated in a centralized manner.

Description

Technical Field

[0001] This invention belongs to the field of municipal sludge resource utilization and disposal technology, and specifically relates to a treatment device for municipal sludge resource utilization and disposal. Background Technology

[0002] Municipal sludge is an unavoidable byproduct of urban wastewater treatment. It contains heavy metals, microorganisms, and various other pollutants. Improper sludge treatment and disposal can lead to secondary environmental problems such as greenhouse gas emissions, groundwater pollution, and land contamination. Currently, municipal sludge drying, pyrolysis, and carbonization technology is an important means of resource-based disposal of municipal sludge.

[0003] Chinese patent CN117447039A discloses a method and integrated equipment for treating municipal sludge using a semi-carbonization coupled carbonization process. By introducing the concept of semi-carbonization, partial carbonization of the material is achieved through direct contact heating, which improves heat treatment efficiency and also helps to improve gas dust removal efficiency.

[0004] CN112851076A discloses a municipal sludge purification and treatment device. By setting up a water purification mechanism and a carbonization mechanism, the water in the sludge and the dewatered sludge can be reused to achieve the effect of "resource utilization". The air outlet pipe on the carbonization machine can save energy. The design of the limiting hole and gear on the top of the sedimentation tank can prevent the second water outlet pipe from being inserted into the sediment at the bottom of the sedimentation tank and extracting the sediment. The design of the stirring mechanism in the stirring tank can save space.

[0005] In the above technologies, the sludge blocks are not crushed during sludge carbonization, resulting in a slower carbonization rate and poorer carbonization degree at the center of the blocks. Therefore, it is necessary to design a device that can crush the blocks during the carbonization process. Summary of the Invention

[0006] To address the aforementioned problems in existing technologies, this solution provides a treatment device for the resource-based disposal of municipal sludge.

[0007] The technical solution adopted in this invention is as follows:

[0008] A treatment device for the resource utilization and disposal of municipal sewage sludge includes a sludge carbonizer, a mounting base, and a combustion furnace;

[0009] The sludge carbonizer includes an inner cylinder and an outer cylinder. The bottom of the inner cylinder is provided with a conical base, through which lumpy sludge can be added from the top inlet of the inner cylinder and supported by the conical base. The outer cylinder is coaxially sleeved on the outer cylinder, and there is a double helical channel between them. The two helical channels are used for the helical conveying of flue gas and sludge, respectively. The bottoms of the two helical channels are respectively connected to the flue gas outlet of the combustion furnace and the inner bottom of the inner cylinder.

[0010] The mounting base is located below the sludge carbonizer. The mounting base is connected to an annular seat fixed to the outside of the outer cylinder through multiple magnetic devices and multiple inclined spring plates. When the magnetic devices are activated, they can control the up and down movement of the sludge carbonizer.

[0011] As an alternative or supplement to the above structure: a sludge spiral plate and a flue gas spiral plate are provided between the outer cylinder and the inner cylinder; the sludge spiral plate and the flue gas spiral plate are arranged in a double spiral to form a double spiral channel; the upper side of the sludge spiral plate is provided with stepped texture and the lower side is provided with heat-absorbing fins.

[0012] As an alternative or supplement to the above structure: multiple layers of baffles are provided at the center of the inner cylinder, and the gaps at each layer of baffles gradually decrease from top to bottom.

[0013] As an alternative or supplement to the above structure: a smoke outlet and a slag discharge outlet are respectively provided at the top of the two spiral channels; a return air port is provided on the side wall of the upper part of the inner cylinder, which is opposite to the slag discharge outlet; an air intake pipe is provided at the return air port, which is directed in the opposite direction to the top inlet; the air intake pipe siphons the air at the slag discharge outlet through the return air port.

[0014] As an alternative or supplement to the above structure, the treatment device for the resource utilization of municipal sludge also includes a belt conveyor, one end of which extends to the ground and the other end extends to the top inlet of the sludge carbonizer to transport sludge.

[0015] As an alternative or supplement to the above structure: a flue gas hood is provided outside the belt conveyor, the flue gas hood includes an inner hood and an outer hood, and the belt conveyor is located inside the inner hood; one end of the inner hood is connected to the top inlet and the other end is provided with a first exhaust port; one end of the outer hood is connected to the outer cylinder of the sludge carbonizer and the other end is provided with a second exhaust port, and the exhaust port is connected to the channel between the inner hood and the outer hood.

[0016] As an alternative or supplement to the above structure: the input end of the belt conveyor extends out of the inner cylinder, and an air jet ring is provided at the input end of the belt conveyor for spraying air into the inner cylinder.

[0017] As an alternative or supplement to the above structure: an upper flexible connecting ring is provided between the inner sleeve and the inner cylinder, and between the outer sleeve and the outer cylinder; a lower flexible connecting ring is provided between the sludge carbonizer and the flue gas outlet.

[0018] As an alternative or supplement to the above structure: a furnace bridge is provided inside the combustion furnace, and fresh air inlets and ash discharge outlets are respectively provided on the left and right sides of the space below the furnace bridge; a filling port is provided on one side of the space above the furnace bridge.

[0019] As an alternative or supplement to the above structure: multiple inclined spring plates and multiple magnetic devices are installed between the annular seat and the mounting base. The multiple inclined spring plates and multiple magnetic devices are arranged in a ring, and the inclined spring plates and magnetic devices are arranged alternately.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This solution, through the combination of a magnetic device and an inclined spring plate, enables the sludge blocks to be conveyed, vibrated, and carbonized in the sludge carbonizer. The flue gas from the combustion furnace is used to heat the sludge blocks, and the vertical and tangential movements of the sludge carbonizer are used to convey the sludge blocks. At the same time, the vibration of the sludge carbonizer is used during the conveying process to break up the sludge blocks, thereby improving the degree and efficiency of carbonization.

[0022] 2. In this scheme, the flue gas from the combustion furnace is separated from the gas generated by the carbonization of mud blocks, which not only facilitates the recovery of waste heat from the flue gas, but also facilitates the centralized treatment of harmful gases generated by the carbonization of mud blocks. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this scheme or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0024] Figure 1 This is a schematic diagram of the sludge carbonization device;

[0025] Figure 2 This is a schematic diagram of the structure of the sludge carbonizer and the combustion furnace.

[0026] Figure 3 This is a diagram of the internal structure of a sludge carbonizer;

[0027] Figure 4 This is a structural diagram showing the connection between the sludge carbonizer and the flue gas hood.

[0028] Figure 5 This is a schematic diagram of the flue gas hood.

[0029] In the diagram: 1-Belt conveyor; 2-Flue gas hood; 21-Inner hood; 22-Outer hood; 23-First flue gas outlet; 24-Second flue gas outlet; 3-Jet ring; 4-Air intake pipe; 5-Sludge carbonizer; 51-Slag discharge port; 52-Top inlet; 53-Flue gas outlet; 54-Annular seat; 55-Return air port; 56-Inner cylinder; 57-Outer cylinder; 58-Sludge spiral plate; 59-Baffle; 510-Conical base; 511-Heat-absorbing fins; 512-Flue gas spiral plate; 6-Inclined spring plate; 7-Mounting base; 8-Combustion furnace; 81-Fresh air inlet; 82-Furnace bridge; 83-Slag discharge port; 84-Injection port; 85-Flue gas outlet; 9-Magnetic device; 91-Iron block; 10-Upper flexible connecting ring; 11-Lower flexible connecting ring. Detailed Implementation

[0030] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this solution without creative effort are within the protection scope of this solution.

[0031] Example

[0032] like Figures 1 to 5 As shown in the figure, this embodiment designs a treatment device for the resource utilization of municipal sludge, including a belt conveyor 1, a flue gas hood 2, a sludge carbonizer 5, a mounting base 7, and a combustion furnace 8.

[0033] The belt conveyor 1 is used for conveying lumpy sludge (mud blocks). One end of the belt conveyor 1 extends to the ground and the other end extends to the top inlet 52 of the sludge carbonizer 5 to transport the sludge. When the worker puts the sludge to be carbonized into the input end of the belt conveyor 1, the mud blocks can move and rise along the belt conveyor 1 and then enter the sludge carbonizer 5.

[0034] The flue gas hood 2 is a tubular hood, comprising an inner hood 21 and an outer hood 22. The outer hood 22 is fitted over the inner hood 21. The inner hood 21 is used to transport the harmful gases generated during the carbonization of sludge, while the channel between the inner hood 21 and the outer hood 22 is used to transport the flue gas generated by the combustion furnace 8. Furthermore, a belt conveyor 1 is installed inside the inner hood 21. One end of the inner hood 21 is connected to the top inlet 52, and the other end is provided with a first exhaust port 23. This allows the harmful gases generated during sludge carbonization to be returned from the top inlet 52 to the inner hood 21, then flow in the opposite direction (against the conveying direction of the belt conveyor 1) along the inner hood 21, and finally exit from the first exhaust port 23 to a unified waste gas treatment device for harmless treatment. During the reverse flow of the harmful gases generated during sludge carbonization, the sludge on the belt conveyor 1 is preheated. One end of the outer cover 22 is connected to the outer cylinder 57 of the sludge carbonizer 5, and the other end is provided with a second flue gas outlet 24. The flue gas outlet 53 is connected to the channel between the inner cover 21 and the outer cover 22. The flue gas generated by the combustion furnace 8 enters the space between the inner cover 21 and the outer cover 22 from the flue gas outlet 53 and flows in the opposite direction along the outer cover 22 (opposite to the conveying direction of the belt conveyor 1). Finally, it is led out from the second flue gas outlet 24. The flue gas after being led out can be directly discharged into the air or further recycled for waste heat. In addition, during the reverse flow of the flue gas generated by the combustion furnace 8, the sludge on the inner cover 21 and the belt conveyor 1 is preheated to realize the recycling of flue gas waste heat.

[0035] The input end of the belt conveyor 1 extends outside the inner cylinder 56 to facilitate workers adding mud blocks to the input end of the belt conveyor 1. An air jet ring 3 is provided at the input end of the belt conveyor 1. The air jet ring 3 is used to spray air into the gap between the lower end of the inner cylinder cover and the belt conveyor 1, thereby preventing harmful gases in the inner cylinder cover from leaking out from the gap and ensuring that the harmful gases generated by the carbonization of the mud blocks are discharged from the first exhaust port 23.

[0036] The sludge carbonizer 5 includes an inner cylinder 56 and an outer cylinder 57. Both the outer cylinder 57 and the inner cylinder 56 are hollow cylindrical structures. The outer cylinder 57 is coaxially arranged outside the inner cylinder 56. The outer cylinder 57 and the inner cylinder 56 are connected by two spiral plates. The inner side of the spiral plates is sealed to the outer wall of the inner cylinder 56, and the outer side of the spiral plates is sealed and fixedly connected to the inner wall of the outer cylinder 57. The two spiral plates are a sludge spiral plate 58 and a flue gas spiral plate 512. The sludge spiral plate 58 and the flue gas spiral plate 512 are arranged in a double spiral to form a double spiral channel. The two spiral channels are used for the spiral conveying of flue gas and sludge, respectively. The upper side of the sludge spiral plate 58 is provided with stepped textures, which allows the sludge to spiral upward along the sludge spiral plate 58 while reducing the reverse rolling of sludge. A heat-absorbing fin 511 is provided on the lower side of the sludge spiral plate 58. The heat-absorbing fin 511 extends into another spiral channel, so that when the flue gas enters the other spiral channel, the heat in the flue gas can be transferred to the sludge spiral plate 58 through the heat-absorbing fin 511, thereby carbonizing the sludge at high temperature.

[0037] The bottom of the inner cylinder 56 is provided with a conical base 510. Blocky sludge can be added from the top inlet 52 of the inner cylinder 56 and supported by the conical base 510. During the vibration of the sludge carbonizer 5, sludge blocks collide continuously with each other and with the conical base 510, causing the sludge blocks to break. In the two spiral channels, the bottom of one spiral channel is connected to the inner bottom of the inner cylinder 56, allowing the broken sludge blocks to slide down the conical surface of the conical base 510 and enter the bottom of the spiral channel, rising continuously along the sludge spiral plate 58. The bottom of the other spiral channel is connected to the flue gas outlet 85 of the combustion furnace 8. The high-temperature flue gas generated after combustion in the combustion furnace 8 can enter the bottom of the spiral channel through the flue gas outlet 85 and then rise continuously in a spiral. The flue gas spiral plate 512 separates the flue gas from the harmful gases generated by sludge carbonization, thereby preventing the flue gas from being polluted.

[0038] The mounting base 7 is located below the sludge carbonizer 5. The mounting base 7 is connected to the annular seat 54 fixed to the outside of the outer cylinder 57 via multiple magnetic devices 9 and multiple inclined spring plates 6. An iron block 91 is installed on the annular seat 54. When the magnetic devices 9 are activated and generate magnetic force, they can magnetically attract the iron block 91, causing the entire sludge carbonizer 5 to descend. When the magnetic field of the magnetic devices 9 changes and loses its magnetic force on the iron block 91, the multiple inclined spring plates 6 push the sludge carbonizer 5 upward and reset. At the same time, since the inclined spring plates 6 are installed at an angle, as the inclined spring plates 6 push the sludge carbonizer 5 upward, they also push the sludge carbonizer 5 to move in the tangential direction, completing a small-amplitude circumferential rotation. During this process, the sludge can continuously collide and break up in the sludge carbonizer 5 and rise along the sludge spiral plate 58. Multiple inclined spring plates 6 and multiple magnetic devices 9 are installed between the annular seat 54 and the mounting base 7. The multiple inclined spring plates 6 and multiple magnetic devices 9 are arranged in a ring, and the inclined spring plates 6 and magnetic devices 9 are arranged alternately.

[0039] The top of the two spiral channels of the sludge carbonizer 5 is respectively provided with a flue gas outlet 53 and a slag discharge outlet 51; wherein, the flue gas outlet 53 is connected to the channel between the inner sleeve 21 and the outer sleeve 22, and a return air outlet 55 is provided on the upper side wall of the inner cylinder 56, which is opposite to the slag discharge outlet 51; an air intake pipe 4 is provided at the return air outlet 55, which is opposite to the top inlet 52; the air intake pipe 4 siphons the air at the slag discharge outlet 51 through the return air outlet 55.

[0040] The inner cylinder 56 has multiple layers of baffles at its center, with the gaps between each baffle layer decreasing from top to bottom. This allows large pieces of mud to be blocked by the upper baffles and broken up by continuous collisions with them, falling to the lower baffles for further breaking until they fall onto the conical base 510, where the mud is initially broken up.

[0041] An upper flexible connecting ring 10 is provided between the inner sleeve 21 and the inner cylinder 56, and between the outer sleeve 22 and the outer cylinder 57; a lower flexible connecting ring 11 is provided between the sludge carbonizer 5 and the flue gas outlet 85. The lower flexible connecting ring 11 achieves a seal at the connection between the sludge carbonizer 5 and the combustion furnace 8, and the upper flexible connecting ring 10 achieves a seal between the sludge carbonizer 5 and the flue gas hood 2. This prevents the leakage of flue gas and harmful gases generated during sludge carbonization.

[0042] The combustion furnace 8 is equipped with a furnace bridge 82. Fresh air inlet 81 and ash discharge outlet 51 are respectively provided on the left and right sides of the space below the furnace bridge 82. A filling port 84 is provided on one side of the space above the furnace bridge 82.

[0043] The municipal sludge resource utilization treatment device in this embodiment is used as follows:

[0044] 1. Workers feed the mechanically dewatered sludge blocks into the input end of belt conveyor 1, and the belt conveyor 1 transports them to sludge carbonizer 5; and during the transport process, the sludge blocks are preheated using the residual heat in the flue gas and the residual heat of the harmful gases generated during sludge carbonization.

[0045] 2. Under the vibration of the sludge carbonizer 5, the sludge blocks collide and break with each other and with the sludge carbonizer 5. Breakage occurs at the baffle, conical base 510, and sludge spiral plate 58, which helps to improve carbonization efficiency and degree. Furthermore, the sludge is heated at high temperature by flue gas at the sludge spiral plate 58, thus completing the carbonization of the sludge. The carbonized sludge blocks are discharged from the slag discharge port 51. During this process, the harmful gases generated by sludge carbonization also rise along one of the spiral channels and reach the slag discharge port 51.

[0046] Air is injected into the inner cylinder through the air intake pipe 4, and harmful gas at the slag discharge port 51 is siphoned into the inner cylinder through the return air port 55. This not only reduces the waste of residual heat in the harmful gas, but also reduces the leakage of harmful gas from the slag discharge port 51. The harmful gas flows along the inner cylinder to the first flue gas outlet 23.

[0047] 3. The high-temperature flue gas generated by the combustion in the combustion furnace 8 enters the bottom of the sludge carbonizer 5 through the flue gas outlet 85, and then enters another spiral channel from the bottom of the sludge carbonizer 5. During the process of the flue gas rising in the spiral channel, it carbonizes the sludge on the sludge spiral plate 58 at high temperature. After the flue gas is discharged from the flue gas outlet at the top of the sludge carbonizer 5, it flows to the second flue gas outlet 24 through the channel between the inner and outer cylinder covers. During this process, the residual heat of the flue gas preheats the sludge blocks on the belt conveyor 1.

[0048] The above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation; it is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this technology.

Claims

1. A treatment device for the resource-based disposal of municipal sewage sludge, characterized in that: Includes a sludge carbonizer (5), a mounting base (7), and a combustion furnace (8); The sludge carbonizer (5) includes an inner cylinder (56) and an outer cylinder (57); the bottom of the inner cylinder (56) is provided with a conical base (510), and blocky sludge can be added from the top inlet (52) of the inner cylinder (56) and supported by the conical base (510); the outer cylinder (57) is coaxially sleeved outside the inner cylinder (56), and there is a double spiral channel between them, which is used for the spiral conveying of flue gas and sludge respectively; the bottom of the two spiral channels are respectively connected to the flue gas outlet (85) of the combustion furnace (8) and the inner bottom of the inner cylinder (56); The mounting base (7) is located below the sludge carbonizer (5). The mounting base (7) is connected to the annular seat (54) fixed on the outside of the outer cylinder (57) through multiple magnetic devices (9) and multiple inclined spring plates (6). When the magnetic devices (9) are activated, they can control the sludge carbonizer (5) to move up and down.

2. The treatment device for the resource utilization and disposal of municipal sludge according to claim 1, characterized in that: A sludge spiral plate (58) and a flue gas spiral plate (512) are provided between the outer cylinder (57) and the inner cylinder (56); the sludge spiral plate (58) and the flue gas spiral plate (512) are arranged in a double spiral to form a double spiral channel; the upper side of the sludge spiral plate (58) is provided with a stepped texture and the lower side is provided with heat-absorbing fins (511).

3. The treatment device for the resource utilization and disposal of municipal sludge according to claim 1, characterized in that: The inner cylinder (56) is provided with multiple layers of baffles at its center, and the gaps at each layer of baffles gradually decrease from top to bottom.

4. The treatment device for the resource utilization and disposal of municipal sludge according to claim 1, characterized in that: The top of the two spiral channels has a smoke outlet (53) and a slag discharge outlet (51) respectively; a return air outlet (55) is provided on the upper side wall of the inner cylinder (56), and the return air outlet (55) is opposite to the slag discharge outlet (51); an air intake pipe (4) is provided at the return air outlet (55) in the opposite direction to the top inlet (52); the air intake pipe (4) siphons the air at the slag discharge outlet (51) through the return air outlet (55).

5. The treatment device for the resource utilization and disposal of municipal sludge according to claim 4, characterized in that: The municipal sludge resource utilization treatment device also includes a belt conveyor (1), one end of which extends to the ground and the other end extends to the top inlet (52) of the sludge carbonizer (5) to transport sludge.

6. The treatment device for the resource utilization and disposal of municipal sludge according to claim 5, characterized in that: A flue gas hood (2) is provided outside the belt conveyor (1). The flue gas hood (2) includes an inner hood (21) and an outer hood (22). The belt conveyor (1) is located inside the inner hood (21). One end of the inner hood (21) is connected to the top inlet (52), and the other end is provided with a first exhaust port (23). One end of the outer hood (22) is connected to the outer cylinder (57) of the sludge carbonizer (5), and the other end is provided with a second exhaust port (24). The exhaust port (53) is connected to the channel between the inner hood (21) and the outer hood (22).

7. The treatment device for the resource utilization and disposal of municipal sludge according to claim 5, characterized in that: The input end of the belt conveyor (1) extends out of the inner cylinder (56). An air jet ring (3) is provided at the input end of the belt conveyor (1). The air jet ring (3) is used to spray air into the inner cylinder (56).

8. The treatment device for the resource utilization and disposal of municipal sludge according to claim 5, characterized in that: An upper flexible connecting ring (10) is provided between the inner sleeve (21) and the inner cylinder (56), and between the outer sleeve (22) and the outer cylinder (57); a lower flexible connecting ring (11) is provided between the sludge carbonizer (5) and the flue gas outlet (85).

9. The treatment device for the resource utilization and disposal of municipal sludge according to claim 1, characterized in that: The combustion furnace (8) is equipped with a furnace bridge (82), and fresh air inlet (81) and ash discharge outlet (51) are respectively provided on the left and right sides of the space below the furnace bridge (82); a filling port (84) is provided on one side of the space above the furnace bridge (82).

10. The treatment device for the resource utilization and disposal of municipal sludge according to claim 1, characterized in that: Multiple inclined spring plates (6) and multiple magnetic devices (9) are installed between the annular seat (54) and the mounting base (7). The multiple inclined spring plates (6) and multiple magnetic devices (9) are arranged in a ring, and the inclined spring plates (6) and magnetic devices (9) are arranged alternately.

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