Sand washing device applied to pipe duct sludge treatment system

Abstract

The utility model relates to a sand washing device applied to a pipe duct sludge treatment system. The device comprises a vortex tube cavity used for receiving flushing water discharged by a front-end washing rotary drum and impurities smaller than 10 mm; the Coanda feeding flared pipe is used for changing the water flow direction by utilizing the Coanda effect so as to promote the sedimentation of fine sand; the stirrer motor and the stirrer realize density layering of the mixed liquid; the organic matter discharge electromagnetic valve is used for controlling organic matter discharge; the sand discharging screw rod and the driving motor thereof are used for discharging the cleaned fine sand; the emptying pipe is used for emptying the materials in the device; the water flushing device is used for forming a fluidized sand bed to further clean the sand; and the liquid level sensor monitors the liquid level and realizes automatic water replenishing or water stopping. The device can efficiently separate gravel impurities, improve the separation efficiency, realize high-quality sand recovery and reduce the treatment cost, and is stable in operation, high in adaptability and durable.

Description

Technical Field

[0001] This utility model relates to the field of pipeline sludge treatment technology, specifically a sand washing device applied to pipeline sludge treatment systems. Background Technology

[0002] With urban development, the treatment of sewer sludge has become a crucial issue in environmental engineering. Sewer sludge primarily originates from the maintenance and dredging operations of urban drainage pipes. It contains not only large amounts of inorganic materials such as sand and gravel, but also organic impurities from domestic sewage and industrial wastewater, as well as potentially harmful substances such as heavy metals. According to relevant data, a large city can generate thousands of tons of sewer sludge annually, and this output continues to increase year by year as the city expands and its drainage system improves.

[0003] Existing methods for treating sludge in pipelines mostly involve simple landfilling or off-site transportation. While simple landfilling is convenient and inexpensive, it has many drawbacks. Firstly, sludge transportation costs are high. Due to the high water content and large volume of sludge, frequent calls for sludge transport vehicles are necessary, and the transportation distances are often long, resulting in transportation costs accounting for a significant proportion of the treatment costs. Secondly, leaks are prone to occur during transportation, emitting foul odors and adversely affecting the environment and residents along the route. Furthermore, landfill site selection is becoming increasingly difficult, consuming large amounts of land resources, and harmful substances in the sludge may contaminate soil and water bodies through rainwater runoff or groundwater infiltration, causing long-term damage to the ecological environment.

[0004] Even in some sludge treatment systems, there is still room for improvement in the performance and efficiency of key equipment such as sand washing devices. Some existing sand washing devices are not ideal in terms of separation accuracy, failing to effectively remove organic impurities from the surface of sand particles. This results in low-quality separated sand that is difficult to meet the standards for direct recycling, thus failing to fully realize the advantages of resource recovery. At the same time, some devices are difficult to adapt to the sludge treatment needs of different particle sizes and compositions, lacking flexibility and having limited processing capacity, failing to meet the requirements of large-scale pipeline sludge treatment.

[0005] In view of the above problems, developing a sand washing device with better performance and higher efficiency is of great significance for pipeline sludge treatment systems. It can not only improve sludge treatment efficiency and reduce treatment costs, but also better realize resource recycling and reduce environmental burden. Utility Model Content

[0006] This utility model aims to provide a sand washing device for use in pipeline sludge treatment systems, so as to improve the separation effect and efficiency of sand and gravel impurities during pipeline sludge treatment, and lay the foundation for subsequent sludge reduction, stabilization, harmlessness and resource utilization.

[0007] To achieve the above objectives, this utility model is implemented as follows:

[0008] A sand washing device for use in a pipeline sludge treatment system includes:

[0009] The vortex cavity is used to receive the rinsing water and impurities smaller than 10mm discharged from the front washing drum;

[0010] The Coanda feed bell pipe utilizes the Coanda effect to change the flow direction of the feed water mixture, making it evenly distributed inside the device and promoting the settling of fine sand at the bottom of the device.

[0011] The mixer motor and the mixer drive the mixer to rotate and stir the upper mixture, so that the sand, organic matter and the mixture can be better separated by density;

[0012] Organic matter emission solenoid valve, used to control the emission of organic matter;

[0013] The sand discharge screw and its drive motor: when the sand in the device reaches the set amount, the sand discharge screw starts to rotate under the action of the drive motor to discharge the cleaned fine sand from the device.

[0014] Drain pipe, used to drain material from the device when needed;

[0015] A flushing water device, located at the bottom of the device, is used to introduce an upward flushing water flow to form a fluidized sand bed for further cleaning of the sand;

[0016] A liquid level sensor is used to monitor the liquid level in the device and feed the signal back to the control system to enable automatic water replenishment or water shut-off.

[0017] The above-mentioned sand washing device is applied to the sludge treatment system of pipelines and channels:

[0018] The inner wall of the vortex tube is provided with a flow guiding structure to guide the water flow into a spiral flow, thereby enhancing the sedimentation effect of the sand.

[0019] The Coanda feed horn tube is equipped with a filter screen at the inlet to intercept large particles of impurities and prevent the pipe from clogging.

[0020] The above-mentioned sand washing device is applied to the sludge treatment system of pipelines and channels:

[0021] The impeller blades of the agitator are designed with a special spiral or serrated shape to improve mixing efficiency and stratification effect;

[0022] The pitch and diameter of the sand discharge screw have been optimized to adapt to the discharge requirements of sand with different particle sizes, ensuring smooth sand discharge.

[0023] The above-mentioned sand washing device is applied to the sludge treatment system of pipelines and channels:

[0024] The organic matter emission solenoid valve is connected to a control system, which automatically controls the emission frequency and emission amount according to the content of organic matter in the device.

[0025] The device is also equipped with an intelligent monitoring system, which can monitor the operating status of the equipment in real time and transmit the data to the control center through a remote communication module to realize remote monitoring and fault early warning functions.

[0026] The above-mentioned sand washing device is applied to the sludge treatment system of pipelines and channels:

[0027] The device adopts a modular design, which facilitates installation, disassembly and maintenance;

[0028] The outer surface of the device is provided with a heat insulation layer and an anti-corrosion coating.

[0029] The above-mentioned sand washing device is applied to the sludge treatment system of pipelines and channels:

[0030] The flushing water device includes multiple nozzles, which are evenly distributed at the bottom of the device;

[0031] The device is also equipped with a flushing water recycling system, which filters and purifies the flushing wastewater before reusing it for flushing.

[0032] The above-mentioned sand washing device is applied to the sludge treatment system of pipelines and channels:

[0033] The device is provided with a support structure at its bottom;

[0034] The device is also equipped with safety protection devices.

[0035] The sand washing device proposed in this utility model has the following advantages:

[0036] 1. High-efficiency separation: The vortex tube cavity, Coanda feed horn tube and other components work together to effectively separate sand and water mixtures, improve the efficiency of sand and gravel impurity separation, and ensure the smooth operation of subsequent processing.

[0037] 2. Second, high-quality sand recycling: The cleaned fine sand has low organic matter content (loss on ignition value of 5%) and a particle size of ≥0.2mm, meeting the recycling standards for building materials, etc., realizing resource recycling and reducing processing costs.

[0038] 3. Continuous and stable operation: The components work together seamlessly to achieve continuous and stable sand washing operations, improve the operating efficiency and stability of the pipeline sludge treatment system, and reduce equipment failures and downtime.

[0039] 4. High adaptability: The flushing water volume, stirring speed and other parameters can be flexibly adjusted according to the different characteristics and treatment requirements of the sludge in the pipeline, so as to meet the diverse sludge treatment needs.

[0040] 5. Durable equipment: Parts in contact with materials are made of 304 stainless steel, which has good corrosion resistance and wear resistance, extending the service life of the equipment and reducing maintenance costs. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the pipe sludge treatment system shown in the embodiment.

[0042] Figure 2 This is a schematic diagram of the sand washing device in the embodiment. Figure 1 .

[0043] Figure 3 This is a schematic diagram of the sand washing device in the embodiment. Figure 2 .

[0044] Figure 4 This is a schematic diagram of the sand washing device in the embodiment. Figure 3 .

[0045] Figure 5 This is a schematic diagram of the sand washing device in the embodiment. Figure 4 . Detailed Implementation

[0046] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0047] like Figure 1As shown, a sludge treatment system for pipelines includes a sludge storage tank 10. A horizontal vibrating screen 12 is installed at the sludge inlet of the sludge storage tank 10. An automatic grab bucket 13 transports sludge from the sludge storage tank 10 to a feeding bin 14. The sludge outlet of the feeding bin 14 is connected to a washing drum 15. The front end of the washing drum 15 is connected to a first slag collection basket 17 via a first spiral extruder 16. The bottom end of the washing drum 15 is connected to a sand washing device 18 via a pipe. The bottom end of the sand washing device 18 is connected to a second slag collection basket 20 via a second spiral extruder 19. A fine filter device 21 is connected to the side of the sand washing device 18 via a pipe. The sludge outlet of the fine filter device 21 is connected to a third slag collection basket 22. The water outlet of the fine filter device 21 is connected to an intermediate water tank 23 via a pipe. The water outlet of the intermediate water tank 23 is connected to a hydrocyclone separator and a sand-water separator 24 via a pipe. The hydrocyclone separator and the sand-water separator 24... The sludge outlet is connected to the fourth slag collection basket 25. The outlets of the hydrocyclone separator and sand-water separator 24 are connected to the inclined plate settling tank 26 via pipes. The drainage hole of the inclined plate settling tank 26 is connected to the recycled water tank 27. The outlet of the recycled water tank 27 is connected to the washing drum 15 and the sand washing device 18 via pipes for rinsing the washing drum 15 and the sand washing device 18. The sludge storage tank 10 is semi-underground. Transport vehicles dump sludge from the pipeline into the semi-underground pipeline sludge storage tank 10 for receiving and storing feed.

[0048] like Figures 2-5 As shown, the sand washing device consists of a vortex chamber 1, a Coanda feed horn pipe 2, a mixer motor 3, a mixer 4, an organic matter discharge solenoid valve 5, a sand discharge screw 6, a sand discharge screw drive motor 7, an empty pipe 8, and a flushing water device 9. During operation, the sand-water mixture enters the device through the vortex chamber 1. The Coanda feed horn pipe 2 changes the water flow direction and distributes it evenly, facilitating sand settling at the bottom of the device. The flushing water device 9 introduces an upward flushing flow at the bottom, forming a fluidized sand bed to wash the sand. The mixer motor 3 drives the mixer 4 to agitate the upper mixture, achieving density stratification. When the sand reaches the set amount, the sand discharge screw drive motor 7 drives the sand discharge screw 6 to rotate, discharging clean fine sand. The organic matter discharge solenoid valve 5 opens when needed to discharge organic matter. All components of the device are made of 304 stainless steel, ensuring durability and processing efficiency.

[0049] The sand washing unit works in conjunction with other devices in the system to achieve efficient sludge treatment. Under the action of the automatic grab bucket 13, the sludge from the pipeline is fed into the feeding bin 14. Through the conveying screw within the feeding bin 14, the material is continuously transported and fed into the washing drum 15. Inside the washing drum 15, the material undergoes homogenization and softening treatment. Material smaller than 10mm enters the sand washing unit 18, while material larger than 10mm is washed and discharged. Coarse material larger than 10mm undergoes static dewatering treatment and then enters the first slag collection basket 17 through the subsequently installed first screw extruder 16.

[0050] In the sand washing unit 18, a mixture of sand, organic matter, and water (particle size <10 mm) flows directly into the unit through pipes. Through the Coanda effect and other physical principles within the unit, the mineralized material can be separated from the organic matter. This mineralized material (fine sand / gravel / crushed stone) has a particle size less than 10 mm and greater than 0.2 mm, with an organic loss on ignition content of less than 5%. It is discharged into the second slag collection basket 20 by the extrusion action of the second screw extruder 19. Subsequently, this material can be recycled or sent to a landfill as construction waste.

[0051] During the sand washing and separation process, fine sand larger than 0.2mm is separated and treated. The overflow liquid from the top, along with organic matter, is discharged as liquid through a DN300 stainless steel pipe into a fine filtration device 21 for deep filtration. The fine filtration device 21 can separate organic slag (1-10mm), which is then pressed by a fibrous material output screw conveyor and sent to the third slag collection basket 22 for storage and external transportation. The filtered water enters the intermediate water tank 23.

[0052] The fine filtration device 21 further separates particles smaller than 0.2mm in diameter from the effluent into ultrafine particles using a hydrocyclone separator (a non-aerated horizontal flow grit chamber without a lifting screw, with a processing capacity of 20L / s). The hydrocyclone further separates the solid and liquid components, resulting in the removal of a large amount of inorganic sludge. The fine sand discharged from the hydrocyclone separator enters a sand-water separator for further sedimentation and pressing. The fine sand is then discharged into a fourth slag collection basket for storage and transportation.

[0053] The treated water enters the inclined plate settling tank 26. The water flows in from the bottom of the settling tank 26 and out from the top, utilizing the laminar flow principle to improve the treatment capacity of the settling tank. The treated water then enters the recycled water tank 27. The recycled water tank 27 stores the treated filtrate, which is used to wash the rotary drum 15 and the sand washing device 18. Excess recycled water is discharged into the surrounding municipal sewage pipes.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A sand washing device for use in a pipeline sludge treatment system, characterized in that, include: The vortex cavity is used to receive the rinsing water and impurities smaller than 10mm discharged from the front washing drum; The Coanda feed bell pipe utilizes the Coanda effect to change the flow direction of the feed water mixture, making it evenly distributed inside the device and promoting the settling of fine sand at the bottom of the device. The mixer motor and the mixer drive the mixer to rotate and stir the upper mixture, so that the sand, organic matter and the mixture can be better separated by density; Organic matter emission solenoid valve, used to control the emission of organic matter; The sand discharge screw and its drive motor: when the sand in the device reaches the set amount, the sand discharge screw starts to rotate under the action of the drive motor to discharge the cleaned fine sand from the device. Drain pipe, used to drain material from the device when needed; A flushing water device, located at the bottom of the device, is used to introduce an upward flushing water flow to form a fluidized sand bed for further cleaning of the sand; A liquid level sensor is used to monitor the liquid level in the device and feed the signal back to the control system to enable automatic water replenishment or water shut-off.

2. The sand washing device for a pipeline sludge treatment system according to claim 1, characterized in that: The inner wall of the vortex tube is provided with a flow guiding structure to guide the water flow into a spiral flow, thereby enhancing the sedimentation effect of the sand. The Coanda feed horn tube is equipped with a filter screen at the inlet to intercept large particles of impurities and prevent the pipe from clogging.

3. The sand washing device for a pipeline sludge treatment system according to claim 1, characterized in that: The impeller blades of the agitator are designed with a special spiral or serrated shape to improve mixing efficiency and stratification effect; The pitch and diameter of the sand discharge screw have been optimized to adapt to the discharge requirements of sand with different particle sizes, ensuring smooth sand discharge.

4. The sand washing device for a pipeline sludge treatment system according to claim 1, characterized in that: The organic matter emission solenoid valve is connected to a control system, which automatically controls the emission frequency and emission amount according to the content of organic matter in the device. The device is also equipped with an intelligent monitoring system, which can monitor the operating status of the equipment in real time and transmit the data to the control center through a remote communication module to realize remote monitoring and fault early warning functions.

5. The sand washing device for a pipeline sludge treatment system according to claim 1, characterized in that: The device adopts a modular design, which facilitates installation, disassembly and maintenance; The outer surface of the device is provided with a heat insulation layer and an anti-corrosion coating.

6. The sand washing device for a pipeline sludge treatment system according to claim 1, characterized in that: The flushing water device includes multiple nozzles, which are evenly distributed at the bottom of the device; The device is also equipped with a flushing water recycling system, which filters and purifies the flushing wastewater before reusing it for flushing.

7. The sand washing device for a pipeline sludge treatment system according to any one of claims 1 to 6, characterized in that: The device is provided with a support structure at its bottom; The device is also equipped with safety protection devices.

Images