A room temperature dewatering system for a mixture of sludge and coal slime

Abstract

This invention provides a room-temperature dewatering system for a mixture of sludge and coal slime, comprising two storage hoppers, a mixing chamber, a distributor, multiple vacuum hydraulic dewatering machines, and a material collection device. Feeding screw conveyors are respectively installed between the two storage hoppers and the mixing chamber. A feeding screw conveyor is installed between the mixing chamber and the distributor. A pushing screw conveyor is installed inside the distributor. A tapered dispensing nozzle is installed at the outlet of the distributor, and a dispensing belt is installed at the outlet of the dispensing nozzle. The discharge point of the dispensing belt is connected to the filter belt conveyor of the vacuum hydraulic dewatering machine, and the discharge point of the filter belt conveyor is connected to the material collection device. This invention employs heatless dewatering technology to dewater the material, operates at room temperature, and has no external heat source, avoiding the odor problem caused by sludge evaporation when heated, thus achieving resource utilization of both types of solid waste.

Description

Technical Field

[0001] This invention relates to the field of solid waste resource utilization technology, and in particular to a room temperature dewatering system for a mixture of sludge and coal slime. Background Technology

[0002] With the development of urbanization and industrialization in my country, the sewage treatment rate and the proportion of raw coal sorting have been increasing year by year, leading to a year-on-year increase in the production of sludge and coal slime. Combustion can significantly reduce the volume of solid waste, decompose organic matter, kill harmful microorganisms, and inertize heavy metals. At the same time, the heat generated by combustion can be recovered and utilized, which is considered to be one of the methods that can maximize the "four-fold" treatment of sludge and coal slime.

[0003] Sludge and coal slime are generally characterized by high ash content and low calorific value. Due to the high water content of sludge, it cannot be directly mixed with coal slime for combustion. Sludge dewatering is necessary, typically involving both mechanical and thermal dewatering. Dried sludge usually has a high volatile content, effectively lowering the ignition temperature, but due to its low calorific value and high ash content, it is generally difficult to sustain combustion. Coal slime, on the other hand, is a low-quality fuel, difficult to ignite, but its fixed carbon content is usually high, providing effective heat during combustion. Therefore, considering the respective fuel characteristics of sludge and coal slime, co-firing them can produce a synergistic effect during combustion, forming effective complementarity at different combustion stages. Ultimately, this achieves efficient synergistic combustion and comprehensive volume reduction, which is of great significance for the efficient disposal of sludge and coal slime and realizing "waste treatment with waste."

[0004] Patent CN116253490A discloses a microwave-enhanced continuous sludge drying device and method. It creates a slightly negative pressure hot air drying environment within a static pulse dryer to microwave-dry a mixture of sludge and coal slime. Combined with a cutting and crushing device, moisture is rapidly vaporized, reducing the viscosity of the material particles, while dynamic hot air drying is performed simultaneously. This achieves the separation of dry and wet sludge and coal slime. Some of the dry sludge and coal slime is returned to the wet sludge and coal slime for further drying in the static pulse dryer. After drying, the sludge and coal slime are discharged from the static pulse dryer with hot air. After a second microwave drying, a multi-stage separator achieves gas-solid separation and coal slime / sludge separation, ultimately obtaining dried sludge and coal slime. However, this patent has issues with dust emissions and odor generation.

[0005] Patent CN200710072212.0 discloses the application of sludge with a moisture content of over 80% in the preparation of briquettes. The patent describes using sludge with a moisture content of over 80% to manufacture briquettes. The high-moisture sludge is mixed with coal slime and raw coal, and then thoroughly mixed in a mixing mill. The mixture is then directly fed into a screw extrusion dewatering briquetting machine for dewatering and shaping, and finally dried in a briquetting drying machine to produce hollow or irregular briquettes containing sludge. This patent requires mixing high-moisture sludge with coal slime and raw coal. The dewatering and shaping effect of the mixture in the screw extrusion dewatering briquetting machine is poor. A briquetting drying machine is added to further dry the mixture, but an odor is easily generated during the briquetting drying process. Summary of the Invention

[0006] The purpose of this invention is to provide a room temperature dewatering system for sludge and coal slurry mixtures that avoids generating odors during the production process.

[0007] This invention provides a room temperature dewatering system for a mixture of sludge and coal slime, comprising two storage hoppers, a mixing chamber, a distributor, multiple vacuum hydraulic dewatering machines, and a material collection device. Feeding screw conveyors are respectively installed between the two storage hoppers and the mixing chamber. A feeding screw conveyor is installed between the mixing chamber and the distributor. A pushing screw conveyor is installed inside the distributor. A tapered dispensing nozzle is installed at the outlet of the distributor. A dispensing belt is installed at the outlet of the dispensing nozzle. The discharge position of the dispensing belt is connected to the filter belt conveyor of the vacuum hydraulic dewatering machine. The discharge position of the filter belt conveyor is connected to the material collection device.

[0008] Furthermore, the storage hopper is equipped with an online moisture meter, the feeding screw conveyor is equipped with a water inlet, and the mixing chamber is equipped with a stirrer.

[0009] Furthermore, both of the feeding screw conveyors are equipped with variable frequency motors, which can control the mixing ratio of the two materials entering the mixing chamber by changing the rotation speed of the screw.

[0010] Furthermore, the material distributor also includes a pressure plate bin, the discharge position of the feeding screw conveyor is located above the pressure plate bin, and the discharge port of the pressure plate bin is connected to the pushing screw conveyor.

[0011] Furthermore, the inner diameter of the outer shell of the pusher screw conveyor gradually decreases along the material conveying direction.

[0012] Furthermore, the feed screw conveyor is connected to a drive device via a gear transmission mechanism and a clutch.

[0013] Furthermore, the moisture content of the wet material output by the fabric distributor is between 50% and 65%.

[0014] Furthermore, a track is installed below the fabric belt, and the sliding direction of the track is set perpendicular to the material conveying direction inside the fabric feeder.

[0015] Furthermore, multiple vacuum hydraulic dewatering machines are arranged on the side of the track away from the material feeder, and the arrangement direction of the vacuum hydraulic dewatering machines is perpendicular to the material conveying direction inside the material feeder. The material feeder belt is sequentially connected to multiple vacuum hydraulic dewatering machines.

[0016] Furthermore, the material collection device includes a flat die granulator and a dry material storage silo. The flat die granulator and the filter belt machine are connected by a discharge belt. A bucket elevator and an inlet belt are provided between the flat die granulator and the dry material storage silo. A gate valve located above the transport vehicle is provided at the bottom of the dry material storage silo.

[0017] This invention uses heatless dehydration technology to dehydrate materials, operates at room temperature, and has no external heat source involved, thus avoiding the odor problem of sludge when heated and evaporated, and realizing the resource utilization of two types of solid waste. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a front view schematic diagram of the present invention;

[0020] Figure 2 This is a top view of the present invention;

[0021] Explanation of reference numerals in the attached figures:

[0022] In the diagram: 1-Sludge transport vehicle, 2-Coal slime transport vehicle, 3-Sludge, 4-Coal slime, 5-Sludge storage hopper, 6-Coal slime storage hopper, 7-Sludge screw conveyor, 8-Coal slime screw conveyor, 9-Water inlet, 10-Mixing bin, 11-Feeding screw conveyor, 12-Pressure plate bin, 13-Clutch, 14-Pushing screw conveyor, 15-Distribution nozzle, 16-Wet material, 17-Distribution belt, 18-Railway, 19-Filter belt machine, 20-First vacuum hydraulic dewatering machine, 21-Second vacuum hydraulic dewatering machine, 22-Water-air separator, 23-Drain valve, 24-Water ring vacuum pump, 25-Dry material, 26-Discharge belt, 27-Flat die granulator, 28-Bucket elevator, 29-Inlet belt, 30-Dry material storage bin, 31-Slide valve, 32-External transport vehicle; Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example 1

[0027] like Figure 1 and Figure 2 As shown:

[0028] A normal temperature dewatering system for a mixture of sludge and coal slime includes two storage hoppers, a mixing chamber 10, a distributor, multiple vacuum hydraulic dewatering machines, and a material collection device.

[0029] The two storage hoppers are sludge storage hopper 5 and coal slime storage hopper 6. Both hoppers are built underground, and their top openings are located above ground level. They are used to receive materials from sludge transport vehicle 1 and coal slime transport vehicle 2, respectively. The storage hoppers are equipped with online moisture meters for detecting the moisture content of the incoming materials.

[0030] The sludge storage hopper 5 and the coal slime storage hopper 6 are equipped with grates near their openings to filter out some of the debris.

[0031] A mixing chamber 10 installed on the ground is provided on one side of the storage hopper, and an agitator is installed inside the mixing chamber 10.

[0032] A sludge screw conveyor 7 is installed between the sludge storage hopper 5 and the mixing bin, with the inlet of the sludge screw conveyor 7 located below the bottom outlet of the sludge storage hopper 5; a coal slime screw conveyor 8 is installed between the coal slime storage hopper 6 and the mixing bin 10, with the inlet of the coal slime screw conveyor 8 located below the bottom outlet of the coal slime storage hopper 6, and the outlets of both the sludge screw conveyor 7 and the coal slime screw conveyor 8 located above the top opening of the mixing bin 10.

[0033] Both the sludge screw conveyor 7 and the coal slime screw conveyor 8 are equipped with variable frequency motors. The speed of both the sludge screw conveyor 7 and the coal slime screw conveyor 8 is adjustable. The mixing ratio of sludge and coal slime entering the mixing chamber 10 can be controlled by changing the speed of the screw.

[0034] A water inlet 9 is located at the top of the coal slime screw conveyor 8, and a water supply pipe is connected to the water inlet 9. The sludge 3 contains approximately 80% water, while the coal slime 4 has a water content ranging from 8% to 50%. To ensure uniform mixing and facilitate extrusion molding, a hole needs to be drilled in the screw feeder cylinder of the coal slime 4 to install the water supply pipe. In actual operation, a 30% water content in the coal slime 4 results in the best mixing and extrusion molding effects. A valve to control the water supply can be added to the water inlet 9.

[0035] A material distributor is provided on one side of the mixing chamber 10 along the material conveying direction. The material distributor includes a pressure plate 12, a pusher screw conveyor 14, a material dispensing nozzle 15, and a material dispensing belt 17. A feeding screw conveyor 11 is provided between the mixing chamber 10 and the pressure plate 12. The inlet of the feeding screw conveyor 11 is located below the bottom outlet of the mixing chamber 10, and the outlet of the feeding screw conveyor 11 is located above the top inlet of the pressure plate 12.

[0036] The bottom opening of the pressure hopper 12 is connected to the feed inlet of the pusher screw conveyor 14. In this embodiment, the pressure hopper 12 is a horizontal mixer. The mixed material is pushed into the pusher screw conveyor 14. The inner diameter of the outer shell of the pusher screw conveyor gradually decreases along the material conveying direction.

[0037] The screw conveyor 14 is equipped with a tapered feeding nozzle 15 at its outlet. The feeding nozzle 15 has a feeding belt 17 at its outlet. The material inside the screw conveyor 14 is pushed onto the feeding belt 17 through the feeding nozzle 15. The cross-sectional shape of the rectangular wet material 16 that is pushed out is the same as the outlet shape of the feeding nozzle 15. The moisture content of the wet material 16 output by the feeding nozzle 15 is between 50% and 65%.

[0038] A track 18 is installed below the fabric belt 17, and the fabric belt 17 can slide on the track 18. The track 18 is also equipped with a reciprocating drive device (reciprocating cylinder, electric push rod, etc.) that is connected to the fabric belt 17 and controls the reciprocating sliding of the fabric belt 17. The sliding direction of the fabric belt 17 is set perpendicular to the material conveying direction in the fabric feeder.

[0039] The screw conveyor 14 is connected to a drive unit via a gear transmission mechanism and a clutch 13. The clutch 13 is connected to a controller, which sets the clutch 13 to engage and disengage at set times.

[0040] Multiple vacuum hydraulic dewatering machines are installed on one side of the fabric belt 17 along the material conveying direction. The multiple vacuum hydraulic dewatering machines are arranged in a straight line, and the arrangement direction of the vacuum hydraulic dewatering machines is perpendicular to the material conveying direction inside the fabric.

[0041] The discharge position of the fabric belt 17 is connected to the filter belt machine 19 of the first vacuum hydraulic dewatering machine 20, and the discharge position of the filter belt machine 19 is connected to the material collection device.

[0042] The outlet of the vacuum hydraulic dewatering machine is connected to a water-gas separator 22 via a pipe and a water ring vacuum pump 24. A drain valve 23 is installed below the water-gas separator 22.

[0043] The material collection device includes a flat die granulator 27 and a dry material storage silo 30. The flat die granulator 27 and the filter belt machine 19 are connected by a discharge belt 26. A bucket elevator 28 and an inlet belt 29 are provided between the flat die granulator 27 and the dry material storage silo 30. A gate valve 31 located above the transport vehicle 32 is provided at the bottom of the dry material storage silo 30.

[0044] System process flow:

[0045] First, sludge storage hopper 5 and coal slime storage hopper 6 receive the incoming materials from sludge transport vehicle 1 and coal slime transport vehicle 2, respectively.

[0046] Start the sludge screw conveyor 7 and the coal slime screw conveyor 8. At the same time, add water to the water inlet 9 on the coal slime screw conveyor 8. The moisture content of the incoming sludge 3 and coal slime 4 is detected during transportation. After entering the sludge storage hopper 5 and the coal slime storage hopper 6, the moisture content is detected again by the online moisture meter. The system calculates and analyzes whether to add water or not.

[0047] Adjust the rotation speed of the sludge screw conveyor 7 and the coal slime screw conveyor 8 and the water volume at the water inlet 9 so that the coal slime 4 and sludge 3 enter the mixing chamber 10 in a predetermined ratio and with the correct humidity.

[0048] After the mixing chamber 10 fully mixes the sludge 3 and coal slime 4, the mixture (wet material 16) is fed into the pressure chamber 12 via the feeding screw conveyor 11 at the bottom of the mixing chamber 10. The pressure chamber 12 continuously presses the mixture (wet material 16) into the lower pushing screw conveyor 14.

[0049] The screw conveyor 14 rotates and pushes the material forward. The cylinder of the screw conveyor 14 gradually retracts inward, and the wet material 16 with a moisture content of 60% is squeezed into a cuboid shape through the material distribution nozzle 15 at the discharge port of the cylinder.

[0050] After the wet material 16 is extruded, it reaches the fabric belt 17. At this time, the motor of the fabric belt 17 is not working. The wet material 16 pushes the fabric belt 17 to rotate. The speed at which the wet material 16 is extruded is equal to the speed at which the fabric belt 17 runs.

[0051] As the fabric belt 17 rotates to receive the wet material 16, after receiving a certain length of wet material 16, the clutch 13 disengages at a set time. At this time, the pusher screw conveyor 14 stops rotating, and the fabric belt 17 also stops rotating. A rectangular piece of wet material 16 remains on the fabric belt 17.

[0052] An infrared sensor is installed at a certain distance from the fabric nozzle 15 on the side support of the fabric belt 17. The infrared sensor is electrically connected to the reciprocating drive device on the track 18 of the fabric belt 17. When the wet material 16 is extruded to a certain length, the infrared sensor detects a signal and controls the reciprocating drive device to run and push the fabric belt 17 to slide on the track 18 until it slides to the point where the fabric belt 17 docks with the filter belt machine 19 of the first vacuum hydraulic dewatering machine 20.

[0053] After the fabric belt 17 is aligned with the filter belt machine 19 of the first vacuum hydraulic dewatering machine 20, the fabric belt 17 and the filter belt machine 19 rotate at the same speed and in the same direction. The wet material 16 is transferred to the filter belt machine 19. Then, after the infrared sensor detects that the wet material 16 on the fabric belt 17 has been transported to the filter belt machine 19, the fabric belt 17 returns to below the fabric nozzle 15. The fabric feeder clutch 13 engages, the pusher screw conveyor 14 rotates, the fabric nozzle 15 continues to discharge material, and the fabric belt 17 continues to receive material.

[0054] After receiving the material, the fabric belt 17 carries the wet material 16 to the filter belt machine 19 of the second vacuum hydraulic dewatering machine 21. After docking with the filter belt machine 19 of the second vacuum hydraulic dewatering machine 21, the two belts run at the same speed and in the same direction. The material is brought to the bottom of the second vacuum hydraulic dewatering machine by the filter belt machine 19 of the second vacuum hydraulic dewatering machine 21 for pressing.

[0055] This system can also set the reciprocating drive device on track 18 to timed drive, eliminating the need for sensors. The feeding screw conveyor 14 operates on a timed basis. After the wet material 16 is received on the feeding belt 17, the reciprocating drive device operates on a timed basis to drive the feeding belt 17 to reciprocate on track 18 to connect with the filter belt machine 19 of the first vacuum hydraulic dewatering machine 20, the feeding nozzle 15, and the filter belt machine 19 of the second vacuum hydraulic dewatering machine 21.

[0056] After pressing, the filter belt conveyor 19 conveys the dry material 25 for discharge. The dry material 25 is driven out of the first vacuum hydraulic dewatering machine 20, and the next piece of wet material 16 enters the first vacuum hydraulic dewatering machine 20. The second vacuum hydraulic dewatering machine 21 operates in the same way.

[0057] The dry material 25 continues to move forward with the filter belt conveyor 19 and is conveyed to the discharge belt 26. The discharge belt 26 feeds the dry material 25 into the flat die granulator 27. After granulation, it reaches the bucket elevator 28 and is fed into the dry material storage silo 30 via the silo belt 29. After the material level reaches a certain level, the bottom gate valve 31 of the dry material storage silo 30 is opened, and the dry material 25 is loaded into the transport vehicle 32 for internal and external transport.

[0058] This invention employs heatless dehydration technology to dehydrate materials, operates at room temperature without the intervention of external heat sources, avoids the odor problem caused by sludge evaporation when heated, and realizes the resource utilization of both types of solid waste; it has low energy consumption costs and can meet the sludge treatment needs of medium-sized (Class III) sewage treatment plants with a sewage treatment capacity of 120,000 tons; the equipment requires no manual intervention, can operate fully automatically and around the clock, and has proactive and scalable social benefits.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A room temperature dewatering system for a mixture of sludge and coal slime, characterized in that: The device includes two storage hoppers, a mixing chamber, a distributor, multiple vacuum hydraulic dewatering machines, and a material collection device. Feeding screw conveyors are installed between the two storage hoppers and the mixing chamber, and a loading screw conveyor is installed between the mixing chamber and the distributor. A pushing screw conveyor is installed inside the distributor. A tapered dispensing nozzle is installed at the outlet of the distributor, and a dispensing belt is installed at the outlet of the dispensing nozzle. The outlet of the dispensing belt is connected to the filter belt conveyor of the vacuum hydraulic dewatering machine, and the outlet of the filter belt conveyor is connected to the material collection device. The inner diameter of the pushing screw conveyor gradually decreases along the material conveying direction. A track is installed below the dispensing belt, and the sliding direction of the track is perpendicular to the material conveying direction inside the distributor. Multiple vacuum hydraulic dewatering machines are arranged on the side of the track away from the distributor, and the arrangement direction of the vacuum hydraulic dewatering machines is perpendicular to the material conveying direction inside the distributor. The dispensing belt is sequentially connected to multiple vacuum hydraulic dewatering machines. The wet material is squeezed into a cuboid shape through the feeding nozzle. After being squeezed out, the wet material reaches the feeding belt. At this time, the motor of the feeding belt is not working. The wet material pushes the feeding belt to rotate. After receiving a certain length of wet material, the feeding screw stops rotating, and the feeding belt also stops rotating. An infrared sensor is installed on the side support of the fabric belt at a certain distance from the fabric nozzle. When the wet material is extruded to a certain length, the infrared sensor detects a signal and controls the reciprocating drive device to push the fabric belt to slide on the track until it slides to the point where the fabric belt docks with the filter belt machine. The fabric belt and the filter belt machine then rotate at the same speed and in the same direction.

2. The ambient temperature dewatering system for sludge and coal slime mixture according to claim 1, characterized in that: The storage hopper is equipped with an online moisture meter, the feeding screw conveyor is equipped with a water inlet, and the mixing chamber is equipped with a stirrer.

3. The ambient temperature dewatering system for sludge and coal slime mixture according to claim 1, characterized in that: Both of the feeding screw conveyors are equipped with variable frequency motors, which can control the mixing ratio of the two materials entering the mixing chamber by changing the rotation speed of the screw.

4. The ambient temperature dewatering system for sludge and coal slime mixture according to claim 1, characterized in that: The material distributor also includes a pressure plate bin, and the discharge position of the feeding screw conveyor is located above the pressure plate bin. The discharge port of the pressure plate bin is connected to the pushing screw conveyor.

5. The ambient temperature dewatering system for sludge and coal slime mixture according to claim 1, characterized in that: The pusher screw conveyor is connected to a drive unit via a gear transmission mechanism and a clutch.

6. The ambient temperature dewatering system for sludge and coal slime mixture according to claim 1, characterized in that: The moisture content of the wet material output by the cloth feeder is between 50% and 65%.

7. The ambient temperature dewatering system for sludge and coal slime mixture according to claim 1, characterized in that: The material collection device includes a flat die granulator and a dry material storage silo. The flat die granulator and the filter belt machine are connected by a discharge belt. A bucket elevator and an inlet belt are installed between the flat die granulator and the dry material storage silo. A gate valve is installed at the bottom of the dry material storage silo above the transport vehicle.

Images