Sludge in-situ curing equipment for municipal domestic waste landfill

Abstract

The utility model relates to sludge in-situ curing equipment for municipal solid waste landfill, which comprises a sludge curing agent mixing device, a sludge curing jet device and an air power system, the sludge curing agent mixing device comprises a storage bin, a conical part is arranged at the lower part of the storage bin, a first stirring paddle is vertically arranged in the conical part, and a second stirring paddle is vertically arranged in the conical part. A discharging pipe is arranged at the bottom of the conical part, a second stirring paddle is horizontally arranged at the discharging pipe, the discharging pipe is connected with a first feeding port of a first spiral conveyor, and a first discharging port of the first spiral conveyor is connected with a jet mixer through a pipeline; the air power system comprises a screw type air compressor, a compressed air dryer and an air storage tank which are connected in sequence, the air storage tank is connected with the jet mixer through a pipeline, and the jet mixer is connected with the sludge solidification jet device. The sludge in-situ curing equipment can be used for crushing caked materials, so that the materials are uniformly mixed, the material blocking risk is effectively reduced, and internal blockage is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge treatment, in particular to a sludge in-situ solidification device for municipal domestic waste landfills. Background Technique

[0002] A large amount of sludge is generated in each process of urban sewage treatment plants. The sludge has a high water content, a large volume, and may also contain a large number of pathogenic microorganisms, organic pollutants, etc. According to different treatment processes and the water quality of the treated water, the sludge components are also very complex. For the sewage treatment plants in industrial parks of large cities, due to the discharge of a large amount of industrial sewage into the system, the heavy metal content in the sludge of such sewage treatment plants is relatively high, and its content even exceeds the acceptance standard of agricultural compost. At present, the main disposal methods of municipal sludge are sanitary landfill, composting, incineration, etc. Since the construction and operation costs of incineration are relatively high and the requirements for the water content of sludge are strict; while composting treatment occupies a large area, the product application range is relatively narrow and is restricted by the heavy metal content, so municipal sludge is mostly disposed of by sanitary landfill.

[0003] Landfills are mainly used to treat garbage. When the landfill is in a closed state, it is necessary to clean up the landfill. There is a lot of sludge in the landfill, such as the solidification of electroplating sludge, industrial waste residue, fly ash, blast furnace slag hanging, etc. At present, for the disposal of large-scale stockpiled municipal sludge, the in-situ solidification construction method has the advantages of less disturbance to the sludge, less secondary pollution, simple treatment process, and relatively high construction efficiency, and has been widely used. To treat these sludges, it is necessary to stir the sludge through a stirring head, and at the same time, corresponding solidifying agents need to be sprayed and mixed with the sludge during the stirring process to clean up the sludge. However, the existing sludge in-situ solidification equipment is prone to problems such as material jamming and blockage due to uneven mixing of the sludge solidifying agent and material caking.

[0004] Therefore, it is necessary to provide a sludge in-situ solidification device for municipal domestic waste landfills to solve the above technical problems. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a sludge in-situ solidification device for municipal domestic waste landfills, which can break up caked materials, make the materials mix evenly, thereby effectively reducing the risk of material jamming, preventing internal blockage, and greatly reducing the failure rate.

[0006] To solve the above problems, the technical solution adopted by the utility model is:

[0007] A sludge in-situ solidification device for municipal domestic waste landfills, which includes a sludge solidification and mixing device, a sludge solidification spraying device, and an air power system. The sludge solidification and mixing device includes a storage bin, a conical part is provided at the lower part of the storage bin, a first stirring paddle is vertically arranged in the conical part, a discharge pipe is provided at the bottom of the conical part, a second stirring paddle is horizontally arranged at the discharge pipe, the discharge pipe is connected to the first feeding port of the first screw conveyor, and the first discharging port of the first screw conveyor is connected to a jet mixer through a pipeline; The air power system includes a screw air compressor, a compressed air dryer, and a gas storage tank connected in sequence. The gas storage tank is connected to the jet mixer through a pipeline, and the jet mixer is connected to the feeding port of the sludge solidification spraying device through a feeding pipe.

[0008] As an implementation manner of the present utility model, the first discharging port of the first screw conveyor is connected to the second feeding port of the second screw conveyor through a flexible connecting pipe, and the second discharging port of the second screw conveyor is connected to the jet mixer through a pipeline.

[0009] As an implementation manner of the present utility model, one end of the first screw conveyor where the first discharging port is located is connected to a pneumatic balance tank through a connecting pipeline, and a gate valve is provided at the connecting pipeline.

[0010] As an implementation manner of the present utility model, a manual gate valve is provided between the discharge pipe and the first feeding port.

[0011] As an implementation manner of the present utility model, a maintenance opening is provided at one end of the second screw conveyor where the second feeding port is located.

[0012] As an implementation manner of the present utility model, a plurality of air vibrators are evenly arranged circumferentially on the side wall of the conical part.

[0013] As an implementation manner of the present utility model, a mechanical vibrator is provided on the side wall of the conical part.

[0014] As an implementation manner of the present utility model, check valves and gate valves are provided between the screw air compressor and the compressed air dryer, between the compressed air dryer and the gas storage tank, and between the gas storage tank and the jet mixer.

[0015] As an implementation manner of the present utility model, the sludge solidification spraying device includes a mixing barrel and a slurry inlet pipe arranged in the mixing barrel. A feeding port is provided at the upper part of the slurry inlet pipe, and a discharging port is provided at the lower part. A power motor and a mixing head driven by the power motor are installed at the lower end of the mixing barrel.

[0016] As an implementation manner of the present utility model, the sludge solidifying agent is composed of slag cement, fly ash, lime, and sodium metaaluminate.

[0017] The beneficial effects of adopting the above technical solutions are as follows:

[0018] The in-situ sludge solidification equipment provided by the utility model stirs the materials in the conical part through the first stirring paddle to make the materials evenly mixed, sets a second stirring paddle at the discharge pipe to prevent the materials from jamming, and at the same time realizes the crushing of the agglomerated materials. Finally, the mixed sludge curing agent is conveyed into the jet mixer through the first screw conveyor, thereby effectively reducing the risk of jamming, preventing internal blockage, and greatly reducing the failure rate.

[0019] An air vibration hammer and a mechanical vibration hammer are arranged on the side wall of the storage bin, and the two cooperate with each other to promote the full mixing of the various materials of the sludge curing agent, and prevent and eliminate the phenomena of material blockage, arching and sticking in the bin. By setting an air pressure balance tank and a flap valve, the air pressure in the conveying channel can be adjusted to ensure the smooth flow of materials. By setting a second screw conveyor, it can cooperate with the first screw conveyor to convey materials, and can make the materials more evenly mixed. The two are connected by a flexible connecting pipe, which can compensate for the displacement and pressure generated by the vibration of the equipment or pipeline, and ensure the normal operation of the equipment.

[0020] Through the air power system, dry air can be prepared and stored, mixed with the mixed sludge curing agent in the jet mixer, and then sprayed into the sludge through the sludge curing spraying device, and the sludge and the sludge curing agent are stirred and mixed under the action of the stirring head to carry out in-situ sludge solidification. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the utility model.

[0022] Figure 2 is a front view structural schematic diagram of the utility model.

[0023] Figure 3 is Figure 2 a schematic structural diagram of the stirring and mixing system in

[0024] Wherein: 1 is the feed inlet, 2 is the slurry inlet pipe, 3 is the mixing drum, 4 is the mixing head, 5 is the discharge outlet, 6 is the feeding pipe, 7 is the storage bin, 8 is the conical part, 801 is the discharge pipe, 9 is the screw air compressor, 10 is the compressed air dryer, 11 is the air storage tank, 12 is the power distribution cabinet, 13 is the check valve, 14 is the gate valve, 15 is the jet mixer, 16 is the feed pipe, 17 is the first mixing paddle, 1701 is the first mixing motor, 18 is the air vibrating hammer, 19 is the mechanical vibrating hammer, 20 is the second mixing paddle, 21 is the second mixing motor, 22 is the first screw conveyor, 23 is the first conveying motor, 24 is the auger, 25 is the first feeding port, 26 is the first discharging port, 27 is the air pressure balance tank, 28 is the connecting pipeline, 2801 is the slide valve, 29 is the flexible connecting pipe, 30 is the second screw conveyor, 31 is the second conveying motor, 32 is the maintenance opening, 33 is the second feeding port, 34 is the manual gate valve. Detailed implementation manner

[0025] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be clearly and completely described below in conjunction with specific embodiments.

[0026] As Figures 1 - 3 shown, a sludge in-situ solidification device for a municipal domestic waste landfill includes a sludge solidification and mixing device, a sludge solidification spraying device and an air power system. The sludge solidification and mixing device includes a storage bin 7. A conical part 8 is provided at the lower part of the storage bin 7. A first mixing paddle 17 is vertically provided in the conical part 8. A discharge pipe 801 is provided at the bottom of the conical part 8. A second mixing paddle 20 is horizontally provided at the discharge pipe 801. The discharge pipe 801 is connected to the first feeding port 25 of the first screw conveyor 22. The first discharging port 26 of the first screw conveyor 22 is connected to the jet mixer 15 through a pipeline. The air power system includes a screw air compressor 9, a compressed air dryer 10 and an air storage tank 11 connected in sequence. The air storage tank 11 is connected to the jet mixer 15 through a pipeline. The jet mixer 15 is connected to the feed inlet 1 of the sludge solidification spraying device through a feeding pipe 6.

[0027] The in-situ sludge solidification equipment provided by the utility model stirs the materials in the conical part 8 through the first stirring paddle 17 to make the materials evenly mixed. A second stirring paddle 20 is arranged at the discharge pipe 801 to prevent the materials from jamming, and at the same time, break the caking of the powdery materials caused by humid air, so that the materials enter the screw conveyor with the same looseness and fluid characteristics. Finally, the mixed sludge curing agent is conveyed to the jet mixer 15 through the first screw conveyor 22, thereby effectively reducing the risk of jamming, preventing internal blockage, and greatly reducing the failure rate. Through the air power system, dry air can be prepared and stored. After being mixed with the mixed sludge curing agent in the jet mixer 15, it is sprayed into the sludge through the sludge solidification spraying device, and the sludge and the sludge curing agent are stirred and mixed under the action of the stirring head 4 to carry out in-situ sludge solidification.

[0028] As Figure 3 shown, in this embodiment, the in-situ sludge solidification equipment further includes a second screw conveyor 30 arranged between the first screw conveyor 30 and the jet mixer 15. The first discharge port 26 of the first screw conveyor 22 is connected to the second feeding port 33 of the second screw conveyor 30 through a flexible connecting pipe 29, and the second discharge port of the second screw conveyor 30 is connected to the jet mixer through a pipeline. By setting the second screw conveyor 30, it can cooperate with the first screw conveyor 22 to convey the materials, and can make the materials more evenly mixed. The two are connected through the flexible connecting pipe 29, which can compensate for the displacement and pressure generated by the vibration of the equipment or pipeline, and ensure the normal operation of the equipment.

[0029] One end of the first screw conveyor 22 where the first discharge port 26 is arranged is connected to the air pressure balance tank 27 through a connecting pipeline 28, and a knife gate valve 2801 is arranged at the connecting pipeline 28. By setting the air pressure balance tank 27 and the knife gate valve 2801, the air pressure in the conveying channel can be adjusted to ensure the smooth flow of the materials.

[0030] A manual knife gate valve 34 is arranged between the discharge pipe 801 and the first feeding port 25, which is used when replacing and overhauling the first screw conveyor 22 to prevent the materials in the storage bin 7 from leaking. One end of the second screw conveyor 30 where the second feeding port 33 is arranged is provided with a maintenance port 32; one end of the first screw conveyor 22 where the first feeding port 25 is arranged is also provided with a maintenance port 32; the maintenance port 32 is used for maintenance when the materials are blocked or mechanical failures occur.

[0031] As Figure 3 shown, a plurality of air vibration hammers 18 and mechanical vibration hammers 19 are evenly arranged circumferentially on the side wall of the conical part 8, and the two cooperate with each other to promote the full mixing of the materials of the sludge curing agent, and prevent and eliminate the phenomena of material blockage, arching and sticking to the bin.

[0032] A check valve 13 and a gate valve 14 are provided between the screw air compressor 9 and the compressed air dryer 10, between the compressed air dryer 10 and the gas storage tank 11, and between the gas storage tank 11 and the jet mixer 15. A power distribution cabinet 12 is also equipped for power distribution.

[0033] The sludge solidification spraying device includes a mixing cylinder 3 and a slurry inlet pipe arranged in the mixing cylinder 3. The upper part of the slurry inlet pipe is provided with a feed inlet, and the lower part is provided with a discharge outlet. A power motor and a mixing head driven by the power motor are installed at the lower end of the mixing cylinder 3. The sludge solidification spraying device is a conventional device in the field of in-situ sludge solidification and will not be described in detail here.

[0034] The jet mixer 15 is a commonly used fluid dynamics device. The nozzle sprays high-speed compressed air, forming a local low pressure around it. The well-mixed sludge curing agent powder is entrained, carried, accelerated, and discharged by the compressed air. The powder and the compressed air are mixed at a relatively high speed in the mixing cavity and then ejected.

[0035] The sludge curing agent, by mass percentage, includes: 69 - 71% of slag cement, 7% of fly ash, 17 - 18% of lime, and 4 - 7% of sodium metaaluminate. Among them, the slag cement is slag Portland cement, the lime is quicklime, and the sodium metaaluminate is industrial-grade sodium metaaluminate.

[0036] One end of the first screw conveyor 22 is provided with a first conveying motor 23 for driving the auger 24 in the first screw conveyor 22; one end of the second screw conveyor 30 is provided with a second conveying motor 31 for driving the auger in the second screw conveyor 30; the first stirring paddle 17 includes stirring blades located at the conical part 8 and a stirring shaft for installing the stirring blades in the middle. The stirring shaft passes through the center of the top of the storage bin 7 and is connected to the rotating motor.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sludge in-situ solidification device for municipal domestic waste landfills, characterized in that: It includes a sludge solidification and mixing device, a sludge solidification spraying device and an air power system. The sludge solidification and mixing device includes a storage bin, a conical part is arranged at the lower part of the storage bin, a first stirring paddle is vertically arranged in the conical part, a discharge pipe is arranged at the bottom of the conical part, a second stirring paddle is horizontally arranged at the discharge pipe, the discharge pipe is connected to a first feeding port of a first screw conveyor, and a first discharging port of the first screw conveyor is connected to a jet mixer through a pipeline; The air power system includes a screw air compressor, a compressed air dryer and a gas storage tank connected in sequence. The gas storage tank is connected to the jet mixer through a pipeline, and the jet mixer is connected to a feeding port of the sludge solidification spraying device through a feeding pipe.

2. The sludge in-situ solidification equipment for municipal domestic waste landfills according to claim 1, characterized in that: The first discharging port of the first screw conveyor is connected to a second feeding port of a second screw conveyor through a flexible connecting pipe, and the second discharging port of the second screw conveyor is connected to the jet mixer through a pipeline.

3. The sludge in-situ solidification equipment for municipal domestic waste landfills according to claim 1 or 2, characterized in that: One end of the first screw conveyor where the first discharging port is arranged is connected to a pneumatic balance tank through a connecting pipeline, and a flap valve is arranged at the connecting pipeline.

4. The sludge in-situ solidification equipment for municipal domestic waste landfills according to claim 3, characterized in that: A manual gate valve is arranged between the discharge pipe and the first feeding port.

5. The sludge in-situ solidification equipment for municipal domestic waste landfills according to claim 2, characterized in that: An inspection port is arranged at one end of the second screw conveyor where the second feeding port is arranged.

6. The sludge in-situ solidification equipment for municipal domestic waste landfills according to claim 1, characterized in that: A plurality of air vibrators are circumferentially and uniformly arranged on the side wall of the conical part.

7. The sludge in-situ solidification equipment for municipal domestic waste landfills according to claim 6, characterized in that: A mechanical vibrator is arranged on the side wall of the conical part.

8. The sludge in-situ solidification equipment for municipal domestic waste landfills according to claim 1, characterized in that: Check valves and gate valves are arranged between the screw air compressor and the compressed air dryer, between the compressed air dryer and the gas storage tank, and between the gas storage tank and the jet mixer.

9. The sludge in-situ solidification equipment for municipal domestic waste landfills according to claim 1, characterized in that: The sludge solidification spraying device includes a mixing drum and a slurry inlet pipe arranged in the mixing drum. A feeding port is arranged at the upper part of the slurry inlet pipe, and a discharging port is arranged at the lower part. A power motor and a mixing head driven by the power motor are installed at the lower end of the mixing drum.

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